Abstract
Simultaneous measurements were made of the scintillations of red and blue light in the atmosphere. The sources were a He-Ne laser at 633 nm and a He-Cd laser at 422 nm. Several horizontal propagation paths were used, and the strength of turbulence and its inner scale were recorded during the experiments. Weak path-integrated turbulence theory predicts a very high correlation between the scintillations at these two wavelengths. We observed that the correlations were lower than this prediction in strong path-integrated turbulence. The weak turbulence theory consists of a double integral that sums contributions from each position along the path and from each turbulent wavenumber. To include the effects of strong turbulence, we assume that the effectiveness of eddies larger than the transverse coherence length of the field at each path position is reduced.
© 1991 Optical Society of America
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